Finger-ring mold.



No. 747,059. PATENTED DEU.'15, 1903.

W. H. FORD.

FINGER RING MOLD.

APPLICATION TILED MAR. so, 1903. RENEWED NOV. 23, 1903.

N0 MODEL.

inserted in the recess therein.

Niin TATES Patented December 15, 1903. I

ATlENT rricnm WILLIAM H. FORD, OF LOWELL, MASSACHUSETTS, ASSIGNOR TO RINGSET COMPANY, OF PORTLAND, MAINE.

FlNGIER RlNG OLD.

SPECIFICATION forming part of Letters Patent No. 747,059, dated December 15, 1903.

Application filed March 30, 1903. Renewed November 23. 1903. Serial No. 182,410. (No model.)

T at whom it may concern:

Be it known that I, WILLIAM H. FORD, a citizen of the United States, residing at Lowell, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Finger-Ring Molds, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention has for its object the production of a novel mold for casting rings and other articles in precious metal, my invention being an improvement on United States Patent No. 662,562, granted to me November 27, 1900. That patent shows a multipart mold comprising two charcoal mold-sections, each having a moldgroove surrounding a core forming an integral part of the section, the core defining the finger size of the ring and a crown-section abutting said mold-sections, the crown section having a crown impression communicating with the mold grooves.

One feature of invention herein to be claimed consists in a mold in which the moldsections and the core are ventilated, as I have found it necessary for the production of a ring free from pin or blow holes that the moldsections and the core be provided with ventslits that will enable the air in the moldgroove to escape from the mold into the atmosphere and yet prevent the gold from escaping from the ringroove to the injury of the casting.

Figure 1 in side elevation represents a mold embodying my present invention in one desirable form. Fig. 2 is a right-hand view of the mold shown in Fig. 1, the mold-groove and .runway being shown in dotted lines. Fig. 3 shows the inner face of one of the moldsections detached and having vent-slits. Fig. 4c is a view of the parts of the mold-sections against which acts the face of the crown-section. Fig. 5 shows a face view of a crownsection, illustrating the impression made by the pattern used herein; Fig. 6 an under side view of the crown-section with the bridge Fig. 7 is a cast in the mold, Figs. 1 to 7; and Fig. 19 shows a modified form of moldsection to be used when the crown-section has but one crown impression.

The mold-sections A A are composed of charcoal. Each section is provided with a mold-groove 12, surrounding an integral core 13. This core has a central hole for the reception of a pin B, by which to center the mold-sections and aline the grooves 12. Each section has a runway 17. These parts may be all as shownin said patent and also as shown in Fig. 9.

The mold-sections have shoulders or flanges a, that project above the surface I), out either as a secant, Figs. 1 to 4:, or as a chord, Fig. 9. These flanges serve to position the longer side edges 20 of the ,cuttlefish section 0, having made in it an impression corresponding with the shape of the crown to be shaped therein by casting.

The use of ventilated charcoal in a mold, as herein described, has resulted in the production for the first time of castings in gold without pin or blow holes, said castings having malleable bodies, and the claws or cramps p arealso malleable. The charcoal mold-sections quickly rise in temperature under the action of the molten gold and prevent the sudden chilling of the gold, causing it to remain liquid in the mold for a time sufficient to impart such a quantity of heat to the cuttlefish crown-section that the gold cast in the 'mold-sections and crown-section cools more slowly, thus annealing not only the shank of the ring, but the claws used to hold stones or other gems.

In ventilating the mold-sections I have provided slits in the core to lead the air from the mold-groove to the exterior of the moldsections, and also preferably the mold-groove will be ventilated through the central. hole in the mold-sections. i

The ventilation shown in the charcoal of the mold-sections, Figs. 1 to 4, comprises a slit or slits 2, out into the mold-sections, said slits starting from the bottom of the space 11,

constituting one end of the mold, and terminating at the back and front of each moldsection. (See Fig. 4.) These slits extend into the mold-sections and the core, and the central slit 2 intersects the central hole 15 of the core. I may provide otherslits 3, which may run from the sides of the mold and intersect the groove 12 substantially to the bottom thereof, said grooves also preferably intersecting the hole 15. Air trapped in the mold-groove by the entrance of the molten metal thereinto from the runway escapes through the vent-slits and the center opening into the'atmosphere. These vent-slits are very fineso fine that they permit the exit of gases, but prevent the passage of metal thereinto to the detriment of the casting.

By the term vent-slit as employed herein I mean such character of fine opening that will permit the passage of gases, but prevent passage of metal thereinto.

In the chosen illustration of my invention, Figs. 1 to 7, the crown-section, preferably of cuttlefish, has pressed into one face thereof a crown-pattern to leave a recess h, Fig. 5, and in the bottom of said recess impressions g 9, corresponding with the shape of the crown-pattern to be duplicated in the ring, said impressions g g reproducing the crowns or parts (see Fig. 8) of the ring for holding stones.

It will be obvious that the shape of the crown impression may be of an y desired form, according to the shape of the pattern. The pattern also, as shown, makes in the recess h grooves m, (see Figs. 5 and 6,) that define parts of the body of the ring, and it will be understood that by extending these grooves m beyond the impressions g in the crownsection the parts 9 of the ring cast in the grooves m will embrace the sides of the finger.

As shown in Figs. 1 to 7, the recess h before casting a ring is provided with a bridge 'na piece of charcoal that acts as a part of the core 13. This bridge has, preferably, a flat face 4 to meet the mold-section at the bottom of the space I). The outer face of the bridge is curved, as shown in Fig. 7, to correspond substantially with the exterior of the core, it serving with the core to complete the finger size of the ring and outline the shape of the ringimmediately underneath the crownsection. v

When casting, the mold is turned or inverted from the position Fig. 1, so that the crownsection is turned downwardly instead of upwardly. When the form of mold -section shown in Fig. 9 is employed, the crown-section will be shaped as shown in my Patent No. 662,562, hereinbefore referred to.

Herein claim is not laid to the flanges or to the particular construction of the cuttlefish or crown section, as those features are claimed in my application, Serial No. 150,193, filed each of said sections having vent-slits extended into the core.

2. A finger-ring mold comprising mold-sections provided with a mold-groove surrounding a core, said mold-sections having ventslits crossing the mold-grooves transversely.

3. A finger-ring mold comprising mold-sections each provided with a mold-groove surrounding a core, said mold-sections having vent-slits entering the core to substantially the bottom of the mold-groove.

4. A finger-ring mold comprising mold-sections containing each a mold-groove surrounding a core, each mold-section being cut away on a line intersecting the mold-groove, the end of each mold-section so formed having a ventslit.

5. A finger-ring mold comprising mold-sections each containing a mold-groove surrounding a core, said sections being cut away on a line intersecting the mold-groove, the end of each mold-section so formed having ventslits, and a crown-section containing a crown impression and abutting the mold-sections having said vent-slits. I

6. A mold having a mold-groove for casting a finger-ring, and a ventilating-slit extending into said groove, said slit being formed to permit the exit of gases but prevent the passage of metal therethrough.

7. In a mold for casting finger-rings, moldsections having each a mold-groove to define the shape of one-half of the width of the ring, and an integral core to define the finger size of the ring, said core being slitted in the direction of its length to enable air in the moldgroove to escape.

8. A mold for casting seamless finger-rings comprising a crown-section having parallel side edges, and mold-sections having each a mold-groove surrounding a core, and ventslits, each section having at one end a runway and at its other end means for insuring the accurate positioning of the crown-section on the end of the mold-sections.

9. In a mold for casting finger-rings, moldsections having each a mold-groove surrounding a core, a runway at one end, anda ventslit at its end opposite said runway extended into said mold-groove.

10. In a mold for casting finger-rings, mold- In testimony whereof I have signed my sections having each amold-groove surronndname to this specification in the presence of ing a. core, a runway, and vent-slits extended two subscribing witnesses.

from the outer sides of the mold-sections be- WILLIAM H. FORD. 5 tween the inner end of the mold-groove and Witnesses:

a line crossing the center of the core at right GEO. W. GREGORY,

angles to the length of the runway. MARGARET A. DUNN. 

